Author: gibbs
Date: Thu Oct 28 04:14:28 2010
New Revision: 214444
URL: http://svn.freebsd.org/changeset/base/214444
Log:
sys/dev/xen/blkback/blkback.c:
In xbb_detach() only perform cleanup of our taskqueue and
device statistics structures if they have been initialized.
This avoids a panic when xbb_detach() is called on a partially
initialized device instance, due to an early failure in
attach.
Sponsored by: Spectra Logic Corporation
Modified:
head/sys/dev/xen/blkback/blkback.c
Modified: head/sys/dev/xen/blkback/blkback.c
==============================================================================
--- head/sys/dev/xen/blkback/blkback.c Thu Oct 28 02:59:25 2010
(r214443)
+++ head/sys/dev/xen/blkback/blkback.c Thu Oct 28 04:14:28 2010
(r214444)
@@ -2827,8 +2827,11 @@ xbb_detach(device_t dev)
DPRINTF("\n");
- taskqueue_free(xbb->io_taskqueue);
- devstat_remove_entry(xbb->xbb_stats);
+ if (xbb->io_taskqueue != NULL)
+ taskqueue_free(xbb->io_taskqueue);
+
+ if (xbb->xbb_stats != NULL)
+ devstat_remove_entry(xbb->xbb_stats);
xbb_close_backend(xbb);
xbb_free_communication_mem(xbb);
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